US9630809B2 - Lifting hook, safety latch of lifting hook and locking and releasing device of safety latch - Google Patents
Lifting hook, safety latch of lifting hook and locking and releasing device of safety latch Download PDFInfo
- Publication number
- US9630809B2 US9630809B2 US14/760,146 US201414760146A US9630809B2 US 9630809 B2 US9630809 B2 US 9630809B2 US 201414760146 A US201414760146 A US 201414760146A US 9630809 B2 US9630809 B2 US 9630809B2
- Authority
- US
- United States
- Prior art keywords
- safety latch
- locking
- hook
- latch
- releasing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003578 releasing effect Effects 0.000 title claims abstract description 88
- 238000005520 cutting process Methods 0.000 claims description 12
- 230000000284 resting effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/34—Crane hooks
- B66C1/36—Crane hooks with means, e.g. spring-biased detents, for preventing inadvertent disengagement of loads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B45/00—Hooks; Eyes
- F16B45/02—Hooks with pivoting or elastically bending closing member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B45/00—Hooks; Eyes
- F16B45/02—Hooks with pivoting or elastically bending closing member
- F16B45/023—Hooks with pivoting or elastically bending closing member the closing member pivoting about an axis perpendicular to the plane of the hook
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B45/00—Hooks; Eyes
- F16B45/02—Hooks with pivoting or elastically bending closing member
- F16B45/024—Hooks with pivoting or elastically bending closing member and having means biasing the closing member about the pivot
- F16B45/026—Hooks with pivoting or elastically bending closing member and having means biasing the closing member about the pivot and including a coil type spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B45/00—Hooks; Eyes
- F16B45/02—Hooks with pivoting or elastically bending closing member
- F16B45/036—Hooks with pivoting or elastically bending closing member with an elastically bending closing member
Definitions
- the invention relates to a lifting hook comprising a hook body with a hook stem and a hook tip; a safety latch with a fastening end and a free latch end, the fastening end of the safety latch being pivotally fastened close to the hook stem so as to move the safety latch between an open position and a closed position, the safety latch being in its open position substantially against the inside of the hook body in a position that leaves a hook jaw free, while in the closed position of the safety latch the latch end extends across the hook jaw to the hook tip and against it, resting against the inside of the hook body and its jaw, closing the jaw; and means for actuating the safety latch, the means comprising a spring arranged between the safety latch and the hook body and forcing the latch end into the closed position, and locking and releasing device for locking the safety latch into the open position and for releasing the safety latch from the open position.
- the invention also separately relates to a safety latch to be attached to existing hooks, the safety latch being of the above-described type, and to a locking and releasing device of the lifting hook safety latch that can be mounted on existing safety latches that are also of the above-described type.
- a safety latch for a lifting hook is to assist a user of the lifting hook of a crane to load and unload the hook safely and efficiently.
- the loading of the hook naturally refers to fastening a load to the hook and the unloading, correspondingly, to releasing the load from the hook.
- Safety and efficiency are considerably increased if the user is able to use both hands at the same time for releasing the load.
- the safety latch In known hooks, the safety latch is typically pressed open against a spring force pushing the safety latch closed, and kept in the open position with one hand. This prevents the use of the other hand for releasing the load as the hand must be used for keeping the safety latch open all the time when the load is being released. Moreover, opening the safety latch of large hooks and keeping it open requires a lot of force. Hence the load is very difficult to release and often another person is needed to keep the safety latch open. There is also a risk of hands or fingers getting caught between the safety latch and the hook body. All this may lead to a temptation to skip the use of the safety latch, for example by tying it permanently into the open position against the inside of the hook body with tape.
- the safety latch may be provided with a kind of operating handle attached pivotally to the safety latch, at a distance from its fastening end, the handle extending around the hook body and being lockable behind the hook body into a position keeping the safety latch open.
- a safety latch of this type is disclosed in U.S. Pat. No. 3,008,210. In this solution, however, the handle has to be separately released after the load has been detached in order to tension the safety latch again to the closed position.
- This releasing action may require quite a lot of strength, and if the safety latch has a powerful spring, the user may still hurt his/her hands if they for some reason get caught between the operating handle and the hook body or between the latch end of the safety latch and the hook body. Then again, if the safety latch is left or forgotten completely open after a load has been fastened and for the duration of a subsequent lifting, the safety latch is of no use. Inserting a hoist belt with one hand into the hook jaw easily rotates the hook. In many cases, handling a hoist belt with two hands prevents the hook from rotating around its vertical axis during handling.
- an object of the invention is to improve the lifting hook and its safety latch so as to enable the aforementioned problems to be solved.
- This object is achieved by a solution of the invention that is characterised in that the locking and releasing device of the safety latch comprises a locking and releasing lever that is arranged to turn freely between a turning axle of the safety latch and latch end in the front area of the safety latch and that in its locking position rests against the hook tip and keeps the safety latch in its open position against the inside of the hook body.
- Preferred embodiments of the invention are disclosed in the dependent claims.
- the invention is based on a lever that is arranged on the safety latch at a distance from its turning axle and with which the safety latch can be kept in its open position by resting this level on the hook tip.
- the safety latch is released by pushing the lever from either direction.
- An advantage of the lifting hook and safety latch according to the invention is that the safety latch is convenient to use and reliable. Consequently, the safety latch improves safety without invoking in the operating staff any desire to avoid using it or to remove it from the actual lifting apparatus.
- the safety latch of the invention is extremely simple, which also makes its manufacturing costs small.
- the use of the safety latch is also very easy, since its operation is clearly visible from its structure. Even though the locking and releasing lever was damaged, it would in not in any way endanger the safe usage of the lifting hook, because in case of damage to the lever, the safety latch always returns to the closed position.
- the safety latch of the invention can also be installed afterward in existing lifting hooks, if their stems have a suitable fastening bore used earlier for a safety latch. If such a fastening bore does not exist, the safety latch can, in some cases, be fastened to the hook by means of a separate band structure, in which case no changes need to be made to the hook or its stem and the strength of the hook remains as originally intended. In addition, this allows the utilization of the original hook, which is usually made by forging and therefore a valuable manufactured piece.
- the locking and releasing lever of the invention can also be installed in old safety latches that are possibly only kept open by hand, if they have suitable side edges for making fastening holes required for fastening the levers. In such a case, bringing the safety latch up to the present standards is especially advantageous.
- FIG. 1 is a side view of a preferred implementation of a safety latch of the invention in its closed position
- FIG. 2 shows the safety latch of FIG. 1 in its open position
- FIG. 3 is a perspective view of the safety latch of FIGS. 1 and 2 in its open position
- FIG. 4 is an exploded view of the safety latch according to FIGS. 1 to 3 ;
- FIG. 5 is a modification of the locking and releasing lever shown in FIGS. 1 to 4 ;
- FIG. 6 is a perspective view of a second implementation of the safety latch according to the invention in its open position
- FIG. 7 is an exploded view of the safety latch according to FIG. 6 ;
- FIG. 8 is a perspective view of a third implementation of the safety latch according to the invention in its closed position
- FIG. 9 shows the safety latch of FIG. 8 in its open position
- FIG. 10 is an exploded view of the safety latch according to FIGS. 8 and 9 ;
- FIG. 11 is a perspective view of a fourth implementation of the safety latch according to the invention in its closed position
- FIG. 12 shows the safety latch of FIG. 11 in its open position
- FIG. 13 is an exploded view of the safety latch according to FIGS. 11 and 12 ;
- FIG. 14 is a perspective view of a fifth implementation of the safety latch according to the invention in its closed position.
- FIG. 15 is an exploded view of the safety latch according to FIG. 14 .
- a lifting hook 1 comprises a hook body 2 provided with a hook stem 4 and a hook tip 5 ; a safety latch 6 with a fastening end 7 and a free latch end 8 , the fastening end 7 thereof being pivotally fastened close to the hook stem 4 so as to move the safety latch between an open position and a closed position, the safety latch 6 being in its open position substantially against the inside of the hook body 2 in a position that leaves a hook jaw G free, while in the closed position of the safety latch 6 the latch end 8 extends across the hook jaw G to the hook tip 5 , resting against it on the inside of the hook body 2 and its jaw G and closing the jaw G; and actuating means of the safety latch which comprise a spring 9 arranged between the safety latch 6 and the hook body 2 and forcing the latch end 8 into the closed position, and a locking and releasing device 10 for locking the safety latch 6 into the open position and releasing it from the open position.
- the locking and releasing device of the safety latch comprises a locking and releasing lever 10 that is arranged to turn freely between a turning axle of the safety latch and the latch end 8 in the front area of the safety latch 6 and that in its locking position rests against the hook tip 5 and keeps the safety latch 6 in its open position against the inner side of the hook body 2 .
- the locking and releasing lever 10 is made up of a bent wire loop, the ends 10 a , 10 b of which are fastened to the safety latch 6 to turn at its sides to make a closed loop-like locking and releasing lever 10 .
- holes 6 b formed in them for the lever 10 to turn in can also be formed in any existing conventional safety latches, on which the lever 10 can then be mounted.
- the lever or loop 10 is somewhat shorter than the safety latch 6 , in other words, on the latch end 8 side of the safety latch 6 , the front end of the lever or loop 10 rests on the safety latch 6 in the closed position of the safety latch 6 , which means that it cannot turn behind the safety latch 6 , when the safety latch 6 returns from the open position to the closed position.
- the lever or loop 10 can be made of 3 mm-thick spring steel, for instance, in which case it can be cold bent into 90-degree angles.
- the lifting hook 1 and its safety latch 6 are in a normal closed position, which means that the latch end 8 of the safety latch 6 extends across the jaw G of the hook to the hook tip 5 , resting against it on the inside of the hook body 2 and its jaw G and closing the jaw G. If in this position, a load is placed on the lifting hook 1 , both the safety latch 6 and the locking and releasing lever 10 sink downward and the safety latch 6 is not locked, but both parts 6 and 10 return to their normal position that keeps the jaw G closed. The locking and releasing lever 10 returns to its place, lifted by the safety latch 6 .
- the safety latch 6 has been turned by hand against the inside of the hook stem 2 , whereby the locking and releasing lever 10 settles or is settled by hand against the hook tip 5 . Now the load may be removed from the lifting hook 1 with no further need to touch it by hand.
- the safety latch 6 moves to its closed position taking the locking and releasing lever 10 with it in the manner described above. In the position of FIG. 2 , the placing of the load in the lifting hook 1 is naturally also possible, in which case the locking and releasing lever 10 also moves the safety latch 6 into its closed position.
- FIG. 5 shows a modification of the locking and releasing lever shown in FIGS. 1 to 4 , in which the locking and releasing lever 100 comprises a two-part bent wire loop, the halves 101 , 102 of which are joined together by a connecting piece 103 in the area touching the hook tip 5 or latch end 8 of the safety latch 6 and the free ends 101 a , 102 a can be fastened to holes 6 b on the side edges 6 a of the safety latch 6 , whereby the assembled locking and releasing lever 100 also resembles a closed loop.
- This solution is suitable for heavy lifting hooks, in which the wire material used in the locking and releasing lever 100 is quite rigid and bending a one-part lever into place in the safety latch 6 would be difficult.
- the connecting piece 103 is formed as a connecting sleeve with inner threads on the inside and the halves 101 and 102 having compatible outer threads.
- the connecting piece 103 preferably forms a rigging screw, in which the threads are right- and left-handed.
- the connecting piece 103 is also locked in place with a locking nut at one end or a locking screw drilled through the wall of the connecting piece 103 .
- the connecting piece 103 may have on its outer surface driver surfaces for a suitable tool, or the connecting piece is held by tongs during twisting. At least the outer surface of the connecting piece 103 may be a rubber or plastic surface that provides suitable friction properties for cooperation with the hook tip 5 .
- the connecting piece 103 may of course be made of a suitable synthetic material to combine all necessary properties in a piece made of one material.
- the safety latch 6 and 7 according to FIGS. 6 and 7 is, in principle, similar to the safety latch 6 of the previous figures, but the locking and releasing lever 200 is formed of a bent wire loop that is only fastened at one end 200 a to a hole 60 b on one side edge 60 a of the safety latch 60 , whereby the locking and releasing lever 200 resembles an open loop.
- This locking and releasing lever 200 can be installed on conventional safety latches, but the installation hole 60 b must be formed or modified in such a manner that the lever 200 cannot turn sideways.
- the wire loop may also end in a closing loop or needle eye, in which case a hoist belt or the like cannot attach to the end of the wire loop.
- the safety latch 160 according to FIGS. 8 to 10 is also, in principle, similar to the safety latches 6 and 60 of the preceding figures, but the locking and releasing lever 300 is now formed of a plate-like part having on its sides fastening lugs 300 a that extend to the sides of the safety latch 160 , and the locking and releasing lever 300 is fastened to the side edges 160 a of the safety latch 160 by a fastening pin 301 extending through the lugs.
- This structure provides the advantage that, with it, the safety latch 160 can be made to remain firmly in its open position, when the back edge 300 b of the lever 300 is designed to rest against the front surface of the safety latch 160 in this position.
- This locking and releasing lever 300 is also suitable for installation in conventional safety latches.
- FIGS. 11 to 13 show a safety latch 260 having on one edge thereof a cutting, into which a locking and releasing lever 400 is arranged that fills the cutting and substantially complies with the shape of the adjacent safety latch portion.
- the back surface of the locking and releasing lever has a fastening lug 400 a and the locking and releasing lever 400 is fastened to the back surface of the safety latch 260 by a fastening pin 401 passing through the lug.
- the turning of the locking and releasing lever 400 from the level of the safety latch 260 backward is prevented by the fastening lug 400 a that extends to and rests against the back surface of the safety latch 260 , when the parts 260 and 400 are level with each other.
- FIGS. 14 and 15 show a safety latch 360 that has in its centre a longitudinal cutting 361 , into which a locking and releasing lever 500 is arranged that fits into this cutting and extends partly to the top surface of the safety latch 360 .
- the back surface of the lever 500 has a fastening lug 500 a , and the locking and releasing lever 500 is fastened to the back surface of the safety latch ( 360 ) by a fastening pin 501 passing through the lug.
- the safety latch structure described above may also be fastened to many existing lifting hooks that have a mounting bore 3 on the front part of their stem for the fastening shaft 11 of the safety latch.
- a suitable mounting part such as a mounting band (not shown in the figures) fastened around the top part of the hook stem 4 or hook body 2 and having a mounting hole arranged for the fastening shaft 11 of the safety latch.
- the mounting band may be shaped to comply with the dimensions of the hook in such a manner that it rests against the support surfaces so as to prevent sliding along the hook. Consequently, a slight loosening of the mounting band does not result in a relative motion of the mounting band with respect to the hook, and the points of the shafts relevant to the operation of the mechanism remain substantially in the same places relative to one another.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
Description
Claims (22)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20135033 | 2013-01-11 | ||
FI20135033A FI125688B (en) | 2013-01-11 | 2013-01-11 | Lifting hook, safety latch for a lifting hook and locking and release device for a safety latch |
PCT/FI2014/050017 WO2014108604A1 (en) | 2013-01-11 | 2014-01-10 | Lifting hook, safety latch of lifting hook and locking and releasing device of safety latch |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150353327A1 US20150353327A1 (en) | 2015-12-10 |
US9630809B2 true US9630809B2 (en) | 2017-04-25 |
Family
ID=51166552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/760,146 Active US9630809B2 (en) | 2013-01-11 | 2014-01-10 | Lifting hook, safety latch of lifting hook and locking and releasing device of safety latch |
Country Status (6)
Country | Link |
---|---|
US (1) | US9630809B2 (en) |
EP (1) | EP2943429B1 (en) |
CN (1) | CN104936884B (en) |
ES (1) | ES2659529T3 (en) |
FI (1) | FI125688B (en) |
WO (1) | WO2014108604A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9958001B2 (en) * | 2015-05-19 | 2018-05-01 | Yi-Rong Jam | Elastic press-lock structure |
US10233964B2 (en) * | 2016-05-23 | 2019-03-19 | Batz Corporation | Carabiner |
US10647551B1 (en) * | 2018-10-25 | 2020-05-12 | Ulven Forging Incorporated | Rope hook assembly having a latch member |
US11286973B1 (en) | 2020-12-22 | 2022-03-29 | Black Diamond Equipment, Ltd. | Systems and methods for carabiner gate automatic locking |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI124871B (en) * | 2012-12-20 | 2015-02-27 | Konecranes Oyj | Lifting hook and safety latch for a lifting hook |
ITMI20131543A1 (en) * | 2013-09-19 | 2015-03-20 | Camp Spa | SNAP HOOK WITH CLIMBING LEVER |
CN112334200B (en) * | 2018-06-28 | 2021-11-30 | 豪埃斯特健康体系股份有限公司 | Interchangeable arm quick release mechanism for chest push exercise machine |
CN108706442B (en) * | 2018-07-27 | 2019-08-30 | 温州职业技术学院 | A kind of Architectural Equipment hanging apparatus |
KR102096251B1 (en) * | 2019-12-04 | 2020-04-02 | 반도호이스트크레인 주식회사 | A Safety Hook Device of Crane |
US11390493B2 (en) * | 2020-06-23 | 2022-07-19 | Columbus Mckinnon Corporation | Safety latch for a hook |
WO2023219954A1 (en) * | 2022-05-10 | 2023-11-16 | Columbus Mckinnon Corporation | Spring latch for a hook |
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US1626866A (en) * | 1926-10-30 | 1927-05-03 | Robert E Neilson | Safety hook |
US3008210A (en) | 1959-09-18 | 1961-11-14 | Elmer O Stovern | Safety crane hooks |
US4013314A (en) * | 1974-03-29 | 1977-03-22 | Archer Jean Francois | Lifting hooks |
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-
2013
- 2013-01-11 FI FI20135033A patent/FI125688B/en active IP Right Grant
-
2014
- 2014-01-10 EP EP14737808.7A patent/EP2943429B1/en active Active
- 2014-01-10 WO PCT/FI2014/050017 patent/WO2014108604A1/en active Application Filing
- 2014-01-10 ES ES14737808.7T patent/ES2659529T3/en active Active
- 2014-01-10 CN CN201480004423.9A patent/CN104936884B/en active Active
- 2014-01-10 US US14/760,146 patent/US9630809B2/en active Active
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US1626866A (en) * | 1926-10-30 | 1927-05-03 | Robert E Neilson | Safety hook |
US3008210A (en) | 1959-09-18 | 1961-11-14 | Elmer O Stovern | Safety crane hooks |
US4013314A (en) * | 1974-03-29 | 1977-03-22 | Archer Jean Francois | Lifting hooks |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9958001B2 (en) * | 2015-05-19 | 2018-05-01 | Yi-Rong Jam | Elastic press-lock structure |
US10233964B2 (en) * | 2016-05-23 | 2019-03-19 | Batz Corporation | Carabiner |
US10647551B1 (en) * | 2018-10-25 | 2020-05-12 | Ulven Forging Incorporated | Rope hook assembly having a latch member |
US11286973B1 (en) | 2020-12-22 | 2022-03-29 | Black Diamond Equipment, Ltd. | Systems and methods for carabiner gate automatic locking |
Also Published As
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FI20135033A (en) | 2014-07-12 |
EP2943429A4 (en) | 2016-10-12 |
EP2943429B1 (en) | 2017-11-22 |
CN104936884A (en) | 2015-09-23 |
WO2014108604A1 (en) | 2014-07-17 |
FI125688B (en) | 2016-01-15 |
EP2943429A1 (en) | 2015-11-18 |
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